Door lock



LA FOREST KNOWLES DOOR LQCK l Filed June 14, 1927 2 Sheets-Sheet 1 g y' l i. l lill HI'. g IIIHI Inventar La F'Oresf Knowles Jan. l, 1929. 1,697,569

LA FOREST KNowLEs DOOR LOCK Filedl June 14, 1927 2 Sheets-Sheet 2 l ttarhey Patented Jan. 1, Y1929. l

narran sra l y resiste serrant erstes.

LA FOREST KNOWLES, OF PORTLAND, MAINE. l l v v DOOR LOCK. Y

Application flied June 14, 1927. Serial No. 198,787.

The present invention relates to an improved door lock of the type provided more particularly for use on swingably'mounted doors. l y

Brieiiy, the invention has referencel to a structure of this class which embodies a casing, a spring projected .latch bolt slidable in a guide therein, a key operated retainer for the bolt, a handle operated means fer retracting the bolt against the tension of the spring, and novel trip mechanism associated with said means.

v My primary aim is to generally improve upon structures of this class by providing one which is characterized by a novel ar rangement of details cooperating .and Vassociated in such a manner as to provide a highly efficient and dependable structure. y

Additional features and advantages predicated upon this new arrangement cf parts` will become more readily apparent fromthc following description and drawings.

In the drawings:

Figure 1 is a side elevation'alview with thev cover plate of the casing removed to expose the internal mechanism. Y

Figure 2 is a horizontal section taken approximately upon the plane of the line the principal parts of the trip( mechanism.y

VFigure 7 is an enlarged detail viewof the roller equipped end of parts shown in Fig ure 6. Y Y

Figure 8 is a fragmentary view on a reduced scale` showing the trip mechanism in a o'sition for holding the bolt retracted.

Re-erring now to the drawings-in detail it will beV seen that the reference character 9 designates generally the bodyportion ofV the casing. This is open on one side and the open sidev is closed by a cover plate 10. 1' he body 9 is cast to accommodate the variousv Y internal detailsV and it includes a separately disposed raised portion 11 '(seeFigure 1) having a socket l2 toa'ccommodate a coiled wit-h operating handles 22 and 23.

spring 13. lThe coil spring surrounds` a guide pin 14 which has its outer end located in a small socket in the inner end of the slidable latch bolt 15 and has its opposite end slidable in a groove 16. The spring bears against `the bottom .of the socket and vagainst the inner end of the bolt l5 in `order to project the locking end of 'this' bolt through the customary vopening in the end of thecasing into the receiver Vin the keeper plate 17. As shown in Figure 3 this bolt is provided on its bottom .and intermediate its ends with a substantially V shaped notch 18 which serves a purpose-to be hereinafter described. Itis provided-on its top withy a transverse socket 19 communicating with elongated slots 20. Thebody l isot course fashioned to provide a gnidethrough which thel bolt slides. At this time attention is invited to an loscillatory rocker shaft 21 journaled forV oscillation in appropriate bearings and provided at its opposite ends This shaft is provided with oppositely extenc'lingarms 24 and 25, the lower arm 24 extending into the socket 19 and being provided with a pin projectable throughand slidableV in` the slotl 20. The upper end of' the arm 25 is'bifurcated.` Incidentally, the `movement of this arm'25 in onedirection is limited by an appropriate stop 26.`

Cooperable with the-bifurcated Vend portion ofthe arm 25 is a novel trip mechanism. i rI his mechanismineludes a rocker 27 which, as shown plainly inrFigure 6, embodies a U-shaped portion 28, an arm extension 29,

and an anti-friction roller 30 on the ei;- tremity of this arm 29. Moreoverl the arm Y 29 is provided with an appropriate bearing mounted for rocking movement on the .pivot j 31 (see Figure 1).

.'lhe arm 29 is'movable in an appropriate opening in the casing and is located'to dis! pose .the roller 3() for cooperation with an inclined abutment plate 32 rigidlyv vmounted on the vdoorrjamb. Connected to the U- shaped portion 28 through the medium of va pair of short links 33 is a longitudinally curved link 34. rThese various links are pivotally connected to. each otherandthe i link 34 is pivotallyconnected to the furea- .tions on the aforesaid arm 25. Itfwill be noted that the curved loweredge of the link 34 rideson a roller 35 carried by the stud` 36. When the ,bolt 15'is projected into the v keeper 17,'the trip mechanism is in the posi# i in av manner to slide bolt 15 inwardly against, tlie'spiing 13; This is accomplished :as alin Figure 8 Where the links are temporarily looked to hold the bolt retracted against the Vtension of' the spring 13.

As shown in Figure 1, an appropriately shapedvpocket 37 is formed in the casing to accommodate a rockably mounted button 38. One end of this button is` movable into the aforesaid notch 18 y (see Figure 3). opposite end however, is "cooperable with a suitably anchored flat Y spring 39. A keyholeiis formedv in one VWall of the socket and permits thel insertion oi' a key tobe employed in .turning the button in a manner toV release it. It desired, a finger piece 110, (see Figure 2) may be mounted on the shaft Which carries vthe button 38 for operating the button from the inside of the door. In other Words,

the finger piece 40 is for releasing the button from the inside and the key is employed'for releasing it from the outside, and it is of course necessaryy to release the button in shown closed, it is Vobvious that the finger piece 40 `is turned torelease the button3S.,

Then, the handle 28 is grasped and moved ready described. In so doing, the links 33 andi serve to rock the'rocker 27 upon its pivot 31 until these parts assume the position shown in Figure 8. When thus positioned, this'mechanism 'serves to hold the bolt 15 retracted. However, when the door is closed, the roller 3() on the end ot the rocker 27 comes Yinto engagement Witlithe Vabutment y `rplate 32. This releaseslthe trip mechanism and `this .their comes .j into play to operate upon the arms 25 and 26 in a manner to. pcr- Vmit thespring 13 to project the bolt 15 into the keeper seat.

. their arrangement and method of coopera-` tion will be quite clear-after considering ,the description in connection vWiththe drawings.

cil

it is believed that the details as well as Therefore,"a more lengthy description is believed to be unnecessary.

While the preferred embodiment of' the invention has been shown and described, it

toA be understood that changes in shape,

size, and rearrangen'ient of parts coming Within the field olanvention may be resorted V.to if desired.

- plate also carried by said jamb, a4 lock casing i carried 'by said door,'a spring pressed lock- The Leef/,5cc

ing .bolt inountflor sliding movement in said casino and projectable through an openintoA tie receiver seat in said keeper, a rock shaft carried by said casing, an operating handle for said rock shaft, an operating coni-iection between said rock shaft and said bolt for retracting said bolt, andy automatically operable trip mechanism in'said casing having ope-rating connection With said shaft for holding said bolt retracted when the door is open and forcooperati-ng with' said abutmentfplate'and releasing said bolt for projecfk tion when the door is closed.

2. In a structure ofthe 'class described, a lock casing lia-ving a guide, a spring pressed locking boltA mounted for sliding movement in said guide', said bolt being provided with a notch, a pocket in said casing, a button" iivotally mounted said pocket and having one end engageablefin said notch,V a spring in said pocket engageabl'e With the oppositcfond ot the button, and operating means for the button.

3. In a structure of. the class described, va lock casing provided with a guide anda raised internal portion in alinement with said guide, said raised portion having a socket anda groove, a locking bolt Vslidable in said guideand Vinto said sock`et,`s.i.id.A 5"

movement Yinr said' casing, spring` means 'for projecting said bolt, a rock shaft journaled for rocking-motion in said casing, an' operatingl connection between said rshaft and bolt, an operating handle for said shaft, a rocker vpivotally mounted in said casing, and linkage connecting 'said rocker- With said.I rock shaft, said rocker comprising. a substantially U-shaped part'vvith which said linkage connected and an arin'provided on its free ciid with an anti-friction roller. 'K

In a; structure of the class described, a casing, a locking bolt slidable in said casing, spring means for projecting said bolt, inaniially manipulated operating means for retracting said bolt against the'action of said spring, and trip mechanism associated With said operating means, -saidtripl mechanisml comprising a`rocker,la pair of short links connected. with said rocker, Va relatively longy longitudinally curved Vlink connected with said short links, a. stop, and af'roller with which said curved link is cooperable. Y

In" testimony vvher'eof'I a'Hi-Xiny Signature.Y

' LA Foiinsr KNoWLiis.

at its opposite ico iis 

